Pyzor
From Atomicorp Wiki
Getting an internal error?
1) Check your firewall. APF of BFD (whatever its called) block it.
2) Check the userid, if you're on Project Gamera it needs to run as the user qscand. This is so it knows where to look for its ~/.pyzor/servers file. If it cant read that, it will never work.
cat /etc/sysconfig/spamassassin
SPAMDOPTIONS="-d -x -q -c -m30 -u qscand"